Re: [SOLVED] Redirect error

No idea yet: not caused by improper config file, incorrect file permission. And looks like program bug or something similar.

I see the latest ports tree has new version of Dovecot (2.2.6) and dovecot-pigeonhole (0.4.2), not sure upgrading them will solve your issue or not, but it's worth to try it on a testing machine first.

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Re: [SOLVED] Redirect error

Could you please try to find out the 'sendmail' program installed by Postfix with 'pkg_info -L' command? It should be /usr/local/sbin/sendmail. Then add parameter 'sendmail_path = /path/to/sendmail' in Dovecot config file like below:

protocol lda {
…
sendmail_path = /usr/local/sbin/sendmail
}

Restarting Dovecot service is required. Then please try again and let us know whether it works for you or not.

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Does my reply help a little? How about buying me a cup of coffee ($5) as an encouragement?